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is a city in and the county seat of Sweetwater County, Wyoming, United States, in the southwestern part of the state. The population was 11,808 at the 2000 census.
The city is known as being one of the first in the United States to ban door-to-door solicitation; see Green River Ordinance.
The Mayor of Green River is Hank Castillion, who was elected in November 2006.
Green River was incorporated in 1868 in what was then the Dakota Territory. The city was the starting point from which John Wesley Powell started his famous expeditions of the Green River, the Colorado River, and the Grand Canyon in the late 1800s. Green River was originally supposed to be a the site of a division point for the Union Pacific Railroad, but when the railroad finally reached the point, officials were surprised to find that a city had already been established there. They moved the division point west to Bryan, Wyoming.
At the time of its incorporation in 1868, Green River had about 2000 residents and permanent adobe buildings were being built. However, when the division point of the railroad was moved west, the city shrank to a mere 101 residents. Just when the city was on the verge of shriveling up, the Black Fork dried up during a drought and the railroad was forced to move the division point back to Green River. The town was officially incorporated under the new laws of Wyoming on May 5, 1891.